header{
    height: 1.333333rem;
    background-color: #ff841d;
    padding:0 .4rem;
    position: relative;
    display: flex;
    justify-content:space-between;
    align-items:center;
}
header .logo img {
    height: .666667rem;
}
header .app img {
    height: .906667rem;
}